Worryingly, the new case is not thought to have had the usual risk factors of travel or contact with another patient.
President Donald Trump appointed Vice President Mike Pence on Wednesday to lead the United States' response to the COVID-19 virus. "I can assure you there's not a Democrat or Republican in Congress that wants anybody to be sick".
Mr Trump and top health officials defended his administration's early response of quarantining exposed individuals and temporarily banning foreigners who had recently been to China from entering the country, crediting it with keeping the number of cases in the United States low. "We expect we will see community spread in this country", said Nancy Messonnier, director of the CDC's National Center for Immunization and Respiratory Diseases.
US philanthropist Bill Gates said the coronavirus was starting to behave like a "once-in-a-century" pathogen, and he urged wealthy nations to help low and middle-income countries strengthen their health systems in hopes of slowing its spread.
He did not rule out further restrictions on travellers from other countries hit by the virus, including South Korea and Italy, when asked. Trump is reportedly deeply concerned about how fears of the coronavirus will impact financial markets; US stock markets have already suffered deep losses over uncertainties and fears surrounding the disease.
On Thursday, two USA officials told Reuters the Trump administration was considering invoking special powers to rapidly expand domestic production of protective masks and clothing to help combat the virus.
Health officials have exhausted an initial $105m in emergency funding and have been looking elsewhere for dollars.
Trump's decision to elevate Pence comes after days of debate over whether the administration should appoint a coronavirus "czar". Senate Democratic Leader Chuck Schumer has called for $8.5 billion.
Of the 15 USA cases, eight have been confirmed in California, one in Washington state, one in Arizona, two in IL, one in MA, and one in Wisconsin.
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He also said Flack had tried to call him, saying he was touched that she had chose to reach out to him. She had pleaded not guilty to assault by beating at a North London court.
Specialists Mario Picone, Dilip Patel and Glenn Carrel, left to right, work on the floor of the New York Stock Exchange, Tuesday, Feb. 25, 2020. "I don't think it is inevitable", Mr Trump told reporters.
Sixty cases have so far been reported in the US.
He said that while only a few cases have turned up in the USA from travellers outside the country, a pandemic would affect every country. Those steps were taken during the 2009 H1N1 flu pandemic.
The National Institutes of Health's top infectious disease chief cautioned a vaccine will not be ready for widespread use for a year or more.
Although a year sounds like a long time, officials said this is the "fastest we have ever gone from a synchronous of a virus to a trial". He said a vaccine is a year to a year-and-a-half away. An additional 45 Americans who have tested positive for the coronavirus have been repatriated from foreign soil - 42 from a cruise ship and three from Wuhan, the Chinese city in which the outbreak originated.
"The Trump administration must stop releasing misleading, unscientific, and false information about whether the coronavirus is controlled or when it will be controlled", Sanders said in a statement on Thursday. Of these 15 cases, eight have fully recovered and returned to their homes, Trump said.
"They have enough problems without you going out and saying they're not doing enough", Trump said to Azar recently, a source familiar with their conversation tells Axios' Jonathan Swan.